Actias, I think there may be a temporary (one or two day) drop in supply for some folks, based on what I've read. I didn't necessarily notice it, because we were both warding off a cold and doing a lot of resting/nursing in the days before I got my period.
What I was a little distressed about as far as nursing is just that I was planning to use breastfeeding amenorrhea/ecological breastfeeding as birth control. It's supposed to work really well *IF* you breastfeed according to specific rules, which I was following. But I got my period back anyway, so I was grouchy and feeling like I was nursing "wrong" since that method isn't going to work for me.
Hopefully you won't notice a drop in supply, or that it's only temporary. That would suck to have to get your period back and deal with that at the same time :-/